JP2019031157A - Vehicle seat - Google Patents

Abstract

To attach an airbag unit which deploys rearward to a seat back frame stably with a simple structure in a vehicle seat.SOLUTION: A seat has: left and right side frames 11; a holder coupled to the corresponding side frames at left and right ends; an airbag unit 21 which is housed in the holder and deploys rearward. The holder has: a holder body defining a recessed part opening rearward; and a flange. The airbag unit has: a case disposed in the recessed part and opening rearward; a lid 42 which closes an opening end of the case and faces the flange at an edge part; and an inflator and an airbag provided in the case. The case and the holder are jointly fastened to one of the side frames by a first fastening member 74 and jointly fastened to the other side frame by a second fastening member 75.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat including an airbag that is deployed rearward.

  2. Description of the Related Art A vehicle seat having an airbag unit that is deployed rearward at the rear portion of a seat back is known. An automobile seat according to Patent Document 1 is provided on the back surface of a seat back, and is supported by a plate-like seat back garnish having an opening, a seat back frame, and outward of the seat back garnish through the opening. A protruding airbag unit.

JP-A-6-278512

  The air bag unit needs to be stably supported by the seat back frame in order to support the reaction force of the air bag to be deployed. Moreover, it is preferable that the attachment structure of the airbag unit to the seat back frame is simple and the attachment operation is easy.

  In view of the above background, an object of the present invention is to attach an airbag unit deployed rearward to a seat back frame with a simple structure and good stability in a vehicle seat.

  In order to solve the above problems, one aspect of the present invention is a vehicle seat (1) including a seat cushion (3) and a seat back (4), and a pair of left and right side frames (11) extending vertically. A seat back frame (6) including: a holder (22) extending to the left and right and coupled to the corresponding side frame at both left and right ends; and an airbag unit (21) received by the holder and deployed rearward The holder has a holder body (29) that defines a recess (28) that opens rearward, and a flange (31) provided at an edge of the recess in the holder body, The airbag unit is disposed in the recess and opens to the rear, and closes the opening end of the case and faces the flange at the edge. A lid (42), an inflator (43) and an airbag (44) provided in the case, and the case and the holder are attached to one of the side frames by a first fastening member (74). It is fastened together and is fastened together with the other side frame by the second fastening member (75).

  According to this aspect, since the airbag unit and the holder are fastened to the left and right side frames, the reaction force of the airbag developed by the left and right side frames can be supported. Moreover, since an airbag unit and a holder are fastened together with a side frame with a volt | bolt, attachment work can be made easy.

  In the above aspect, the case may include a fastening plate (46D) that contacts the outer surface of the flange, and the case may be fastened to the side frame together with the flange in the fastening plate.

  According to this aspect, since the case and the holder are fastened by the fastening plate and the flange located behind the seat back, the fastening work can be easily performed.

  In the above aspect, the flange is formed of resin and has a pair of left and right insertion holes (34) facing the side frames at both left and right ends, and the fastening plate is formed of metal, The first fastening member and the second fastening member may pass through the insertion hole and fasten the respective portions where the fastening plate and the left and right side frames are in contact with each other.

  According to this aspect, since the fastening plate formed of metal directly contacts the side frame, the airbag unit can be supported on the side frame with good stability.

  In the above aspect, the left and right ends of the flange are in contact with the rear surface of the corresponding side frame, and the fastening plate may sandwich the flange from the front and the back between each of the side frames.

  According to this aspect, since the fastening plate is disposed behind the left and right side frames, the side frames can support the positive reaction force generated by the deployment of the airbag with good stability.

  Said aspect WHEREIN: The said case is formed with a metal, has the retainer (46) with which the said inflator was couple | bonded, and the said fastening plate is good to be formed with the said retainer.

  According to this aspect, the load generated in the inflator can be reliably transmitted to the left and right side frames via the retainer including the fastening plate.

  In the above aspect, the case has a pair of left and right pins (53) protruding through the holder body and projecting to the left and right sides, and each of the side frames receives the corresponding pin, and the pin It is good to have the latching hole (25) which controls the movement to the front-back direction.

  According to this aspect, the number of locations where the airbag unit and the side frame are joined increases, so that the side frame can support the airbag unit with good stability.

  In the above aspect, each of the locking holes has a depth toward the left and right outer sides, the vertical hole portion (25A) extending vertically, and the horizontal hole extending rearward from the vertical hole portion and opened rearward. It is good to have a hole (25B).

  According to this aspect, the left and right pins can be simultaneously inserted into the corresponding locking holes from the rear. Thereby, the attachment operation | work of an airbag unit can be made easy. Moreover, since the pin has penetrated the holder, the holder can be supported by the side frame via the pin.

  In the above aspect, the case may include a retainer (46) formed of metal and coupled with the inflator, and each of the pins may be formed integrally with the retainer.

  According to this aspect, the load generated in the inflator can be reliably transmitted to the left and right side frames via the retainer and the pin.

  In the above aspect, the holder includes a bottom wall (29A), an upper wall (29B), left and right side walls (29C), and a lower wall (29D) that define the recess, the upper wall, and the left and right side walls. And a pair of left and right holder weakened portions (35) that extend to the outer peripheral edge of the flange and are torn by the inflation pressure of the airbag, and the left and right pins are the left and right side walls. It is good to penetrate each of these.

  According to this aspect, even when the airbag is deployed, the holder can be supported by the side frame with good stability by the pins.

  In the above aspect, the lid is swingably coupled to the lower edge of the opening end of the case, and is torn at the upper edge and the left and right side edges of the opening end of the case by the inflation pressure of the airbag. It is good to combine via a case weak part (57).

  According to this aspect, the airbag can be deployed upward and rearward.

  In the above aspect, the case may include a pair of left and right second case weakened portions (58) that extend forward from the opening end at both left and right upper ends and are torn by the inflation pressure of the airbag.

  According to this aspect, the airbag can be deployed further upward.

  In the above aspect, the inflator may be disposed in a lower portion in the case, and the airbag may be disposed in the case above the inflator.

  According to this aspect, the airbag can be deployed upward and rearward.

  Said aspect WHEREIN: It further has the skin material (8) which comprised the outer surface of the said seat back, and was equipped with the opening (61) facing the said airbag unit, The edge part of the said opening of the said skin material is, It is good to pass between the said flange and the said lid, to extend in the said recessed part, and to be latched by the said holder main body.

  According to this aspect, since the edge portion of the skin material extends inside the holder covered with the lid, no gap is formed between the skin material and the airbag unit when viewed from the rear.

  According to one aspect of the present invention, the airbag unit and the holder are fastened to the left and right side frames, so that the reaction force of the airbag developed by the left and right side frames can be supported. Moreover, since an airbag unit and a holder are fastened together with a side frame with a volt | bolt, attachment work can be made easy.

  According to the aspect in which the case has a fastening plate that contacts the outer surface of the flange, and the case and the holder are fastened by the fastening plate and the flange, the case and the holder are fastened by the fastening plate and the flange that are located behind the seat back. Therefore, the fastening operation can be easily performed.

  The fastening plate made of metal passes through the insertion hole of the flange made of resin and comes into contact with the side frame, and the first fastening member and the second fastening member are portions where the fastening plate and the side frame come into contact with each other. According to the fastening mode, the airbag unit can be supported on the side frame with good stability.

  According to the aspect in which the left and right ends of the flange abut against the rear surface of the corresponding side frame and the fastening plate clamps the flange from the front and the back with each of the side frames, the fastening plate is disposed behind the left and right side frames. Therefore, the side frame can stably support the forward reaction force generated by the deployment of the airbag.

  According to the aspect in which the case is formed of metal and has a retainer to which the inflator is coupled, and the fastening plate is formed by the retainer, the load generated in the inflator is applied to the left and right side frames via the retainer including the fastening plate. It can be transmitted reliably.

  According to the aspect in which the case has a pair of left and right pins, and each of the side frames has a locking hole for receiving the corresponding pin, the number of coupling points between the airbag unit and the side frame increases. The unit can be supported with good stability.

  According to an aspect in which each of the locking holes has a depth toward the left and right outer sides, and has a vertical hole portion that extends vertically, and a horizontal hole portion that extends rearward from the vertical hole portion and opens rearward. The left and right pins can be simultaneously inserted into the corresponding locking holes from the rear. Thereby, the attachment operation | work of an airbag unit can be made easy. Moreover, since the pin has penetrated the holder, the holder can be supported by the side frame via the pin.

  According to the aspect in which the case is made of metal and has a retainer to which the inflator is coupled, and each of the pins is formed integrally with the retainer, the load generated in the inflator is transferred to the left and right side frames via the retainer and the pin. Can be transmitted reliably.

  According to the aspect in which the holder has a pair of left and right holder weakened portions, and the left and right pins penetrate the left and right side walls, the holder is stably supported by the side frame by the pins even when the airbag is deployed. Can be made.

  According to the aspect in which the lid is coupled to the case via the first case weakened portion, the airbag can be deployed upward and rearward.

  According to the aspect in which the case has the pair of left and right second case weak portions, the airbag can be deployed further upward.

  According to the aspect in which the airbag is disposed above the inflator in the case, the airbag can be deployed upward and rearward.

  According to the aspect in which the edge of the opening of the skin material passes between the flange and the lid, extends into the recess, and is locked to the holder body, the inside of the holder whose edge of the skin material is covered with the lid Therefore, no gap is formed between the skin material and the airbag unit when viewed from the rear.

It is a side view of the seat concerning an embodiment, and is a figure showing the state where an air bag developed Rear view of the seat according to the embodiment Rear view of seat back frame and airbag unit (rear view of seat without skin and pad) Exploded perspective view of airbag unit and holder Retainer perspective view Perspective view of wall member Perspective view of side frame support plate and locking part VIII-VIII sectional view of FIG. IX-IX sectional view of FIG. Cross-sectional view of the airbag unit and the holder when the airbag is deployed

  Hereinafter, an embodiment in which a vehicle seat according to the present invention is applied to a front seat of an automobile will be described with reference to the drawings.

  As shown in FIG. 1, the seat 1 according to the present invention is provided in a front row of an automobile. A seat 1 includes a seat cushion 3 provided on a floor of an automobile via a slide rail 2, a seat back 4 rotatably supported on a rear portion of the seat cushion 3, and a headrest provided on an upper portion of the seat back 4. And 5.

  As shown in FIGS. 2 and 3, the seat back 4 is provided on a seat back frame 6, a pad member 7 (see FIG. 8) supported by the seat back frame 6, and a surface of the pad member 7. 4 and an outer skin material 8 constituting the outer surface.

  The seat back frame 6 includes a pair of left and right side frames 11 that extend vertically, an upper frame 12 that extends left and right and is coupled to the upper ends of the left and right side frames 11, and extends to the left and right and is coupled to the lower portions of the left and right side frames 11. The lower frame 13 and a cross frame 14 extending left and right between the upper frame 12 and the lower frame 13 and coupled to the left and right side frames 11 are provided.

  The upper part of each side frame 11 and the upper frame 12 are formed by bending one pipe material 16. The pipe member 16 has an intermediate portion that extends left and right to form the upper frame 12, and left and right end portions that extend downward to form the upper portions of the left and right side frames 11. The lower part of each side frame 11 is formed by a sheet metal member 17 and is welded to the left and right ends of the pipe material 16 at the upper end. Each side frame 11 is rotatably coupled to the rear end of a seat cushion frame (not shown) that forms the skeleton of the seat cushion 3 at the lower end.

  A pair of left and right pillar support brackets 19 are coupled to the front surface of the upper frame 12. Each pillar support bracket 19 is formed in a cylindrical shape and extends vertically. A pillar support member (not shown) that supports the pillars of the headrest 5 is inserted into the pillar support bracket 19.

  An airbag unit 21 and a holder 22 for supporting the airbag unit 21 are coupled to the left and right side frames 11. Specifically, the airbag unit 21 and the holder 22 are coupled to the support plate 23 and the holder locking portion 24 provided on each of the left and right side frames 11.

  As shown in FIGS. 3 and 7, the left and right support plates 23 are provided at the rear edges of the left and right side frames 11 and protrude in a direction approaching each other. Each support plate 23 has a front and rear surface. The support plate 23 is configured by an edge portion of the sheet metal member 17 that forms the lower portion of the side frame 11. In another embodiment, the support plate 23 may be a plate material coupled to the pipe material 16 or the sheet metal member 17.

  The left and right holder locking portions 24 are provided above the support plate 23 in the inner portions of the left and right side frames 11. Each holder locking portion 24 is formed by an edge portion of the sheet metal member 17, and includes a rear plate 24A extending from the side frames 11 in a direction approaching each other, and a side plate 24B extending forward from the protruding end of each rear plate 24A. Have. The rear plate 24A faces front and back, and the side plate 24B faces left and right.

  Each holder locking portion 24 is formed with a pin locking hole 25. The pin locking hole 25 has a vertical hole portion 25A and a horizontal hole portion 25B, and is L-shaped when viewed from the left-right direction. The vertical hole portion 25A penetrates the side plate 24B in the thickness direction and extends vertically. The horizontal hole portion 25B penetrates the side plate 24B in the thickness direction, extends rearward from the lower end of the vertical hole portion 25A, passes through the rear plate 24A, and opens rearward. The opening end of the lateral hole portion 25B in the rear plate 24A is formed so that the vertical width on the side plate 24B side is narrower than the vertical width on the side opposite to the side plate 24B side. The pin locking hole 25 is a hole having a depth on the left and right outer sides.

  As shown in FIG. 4, the holder 22 has a holder body 29 that defines a recess 28 that opens rearward. The holder 22 is formed in a substantially rectangular parallelepiped box shape, and includes a holder bottom wall 29A (front wall) (see FIG. 8) that defines the bottom (front) of the recess 28, and a holder upper wall 29B that defines the top of the recess 28. And left and right holder sidewalls 29C that define the left and right sides of the recess 28, and a holder lower wall 29D that defines the lower portion of the recess 28. The holder 22 extends to the left and right.

  The holder 22 has a flange 31 provided at the opening edge of the recess 28 of the holder main body 29. The flange 31 extends along the opening edge of the recess 28 (the rear edge of the holder main body 29) and is formed in a frame shape. The flange 31 includes an upper side portion 31A extending left and right along the holder upper wall 29B, left and right side portions 31B extending up and down along the left and right holder side walls 29C, and a lower side portion extending left and right along the holder lower wall 29D. 31C. The flange 31 is formed in a plate shape and has a surface facing rearward. The holder main body 29 and the flange 31 are integrally formed of resin.

  The holder 22 has at least one reinforcing member 32 provided on the flange 31. In the present embodiment, the reinforcing member 32 is formed of a metal plate-like member, and a plurality of reinforcing members 32 are provided. Each reinforcing member 32 is disposed inside the flange 31. The flange 31 may be formed by insert molding so as to include the reinforcing member 32 therein. Each reinforcing member 32 is disposed in parallel with the flange 31 and has a surface facing front and rear.

  In the present embodiment, the reinforcing member 32 is formed of four plate pieces extending linearly, and is disposed on each of the upper side portion 31A, the left and right side portions 31B, and the lower side portion 31C. The reinforcing members 32 are arranged away from each other and are arranged so as to avoid the four corners of the flange 31. That is, each reinforcing member 32 includes left and right ends of the lower side portion 31C (connection portion between the lower side portion 31C and the left and right side portions 31B) and left and right end portions of the upper side portion 31A (the upper side portion 31A and the left and right side sides). It is arrange | positioned in the part except a connection part with the part 31B.

  A flange side insertion hole 34 penetrating in the thickness direction is formed in each of the left and right end portions of the lower side portion 31C, that is, the connection portion with the left and right side portions 31B.

  The holder 22 includes left and right holder weakened portions 35 that extend back and forth along each of the boundaries between the holder upper wall 29B and the left and right holder side walls 29C and that pass through both ends of the upper side portion 31A and extend to the outer peripheral edge of the flange 31. Have. Each holder weak part 35 is formed with a lower tensile strength than the other part of the holder 22. Each holder weak part 35 is good in it being a thin part thinner than the other part of the holder 22. Moreover, each holder weak part 35 may have a groove | channel and several through-holes arranged in a row intermittently. In the flange 31, each holder weak part 35 extends between adjacent reinforcing members 32. That is, each reinforcing member 32 is arranged avoiding each holder weak part 35.

  As shown in FIGS. 4 to 6 and 8, the airbag unit 21 includes a case 41 disposed in the recess 28 and opened rearward, a lid 42 that closes the opening end of the case 41, and the case 41 An inflator 43 and an airbag 44 provided on the vehicle. The case 41 includes a retainer 46 formed of a metal plate, and a flexible wall member 47 formed of resin and coupled to the retainer 46.

  As shown in FIG. 5, the retainer 46 includes a retainer front plate 46 </ b> A whose surface faces front and rear, a retainer lower plate 46 </ b> B that extends rearward from the lower edge of the retainer front plate 46 </ b> A, and a surface of the retainer front plate 46 </ b> A. The left and right retainer side plates 46C extend rearward from the left and right side edges and face to the left and right, and the fastening plates 46D extend downward from the rear edge of the retainer lower plate 46B and face to the front and rear. The retainer 46 is formed by bending a metal plate.

  As shown in FIG. 6, the wall member 47 is formed in a square cylindrical shape that opens forward and backward, and includes a case upper wall 47A, left and right case side walls 47B, and a case lower wall 47C. Each of the left and right case side walls 47B is disposed along the inner surface of the corresponding left and right retainer side plate 46C, and the case lower wall 47C is disposed along the upper surface of the retainer lower plate 46B.

  As shown in FIGS. 4 and 8, the plurality of hooks 49 formed on the case upper wall 47A, the left and right case side walls 47B, and the case lower wall 47C are respectively formed into left and right retainer side plates 46C, retainer lower plates 46B, and The retainer 46 and the wall member 47 are coupled to each other by being locked in a plurality of locking holes 51 formed in each of the retainer front plate 46A. The retainer 46 and the wall member 47 cooperate to form a box shape that opens rearward.

  As shown in FIG. 5, pins 53 project from the retainer side plates 46 </ b> C substantially perpendicularly to the upper portions of the outer surfaces of the left and right retainer side plates 46 </ b> C. The left and right pins 53 are formed in a cylindrical shape and are arranged coaxially with each other. A disc-shaped locking piece 53 </ b> A is coaxially provided at the tip of each pin 53.

  On both left and right ends of the fastening plate 46D, a bulging portion 55 bulging forward is formed. Each bulging portion 55 is formed in a cylindrical shape, and its back side (rear side) is recessed forward. As shown in FIG. 9, the protruding end of each bulging portion 55 is formed in a plane, and a first bolt hole 56 penetrating in the thickness direction is formed in each protruding end.

  As shown in FIG. 6, the lid 42 has a plate shape with its front and rear facing, and is joined to the rear end of the wall member 47 on the front surface. The rear edge of the case lower wall 47C and the lid 42 are coupled to each other so as to be swingable. The rear edge of the case upper wall 47 </ b> A and the left and right case side walls 47 </ b> B and the lid 42 are coupled via the first case weakened portion 57. The first case fragile portion 57 is formed with a lower tensile strength than either the wall member 47 or the lid 42.

  In the present embodiment, the wall member 47 and the lid 42 are integrally formed of resin. The first case weakened portion 57 may be a thin-walled portion that is thinner than the wall member 47 and the lid 42. Moreover, the 1st case weak part 57 may have a some through-hole arranged in a groove | channel and intermittently. In order to allow the lid 42 to swing with respect to the case lower wall 47C, it is preferable that a boundary portion between the rear edge of the case lower wall 47C and the lid 42 is formed thinner than other portions.

  At both left and right ends of the case upper wall 47A, second case weakened portions 58 are formed that extend in the front-rear direction and reach the rear edge of the case upper wall 47A. Each second case weakened portion 58 preferably extends to the front edge of the case upper wall 47A. The second case fragile portion 58 is formed with a lower tensile strength than either the wall member 47 or the lid 42. The second case fragile portion 58 may be a thin portion that is thinner than the case upper wall 47A and the left and right case side walls 47B. Moreover, the 2nd case weak part 58 may have a groove | channel and several through-holes arranged in a row intermittently.

  The outer peripheral portion of the lid 42 extends outward from the wall member 47. As shown in FIG. 8, the lower edge part of the lid 42 is arrange | positioned in the position facing the fastening plate 46D. As shown in FIG. 6, the lower edge portion of the lid 42 has a notch 59 at a position facing the left and right bulged portions 55.

  As shown in FIG. 8, the inflator 43 is a device that generates gas for inflating the airbag 44, and has a cylindrical outer shape. The inflator 43 is arranged at the lower part in the case 41 so as to extend left and right. The inflator 43 is fastened to the case lower wall 47C of the retainer 46 by bolts.

  The airbag 44 is a bag body and is connected to the inflator 43. The airbag 44 is formed in a circular arc shape that protrudes upward at the time of deployment, is connected to the inflator 43 at the proximal end, and the distal end is positioned rearward with respect to the inflator 43. In the initial state, the airbag 44 is folded and disposed above the inflator 43 in the case 41. After the inflator 43 and the airbag 44 are disposed on the retainer 46, the wall member 47 integral with the lid 42 is attached to the retainer 46, so that the inflator 43 and the airbag 44 are provided inside the case 41.

  The skin material 8 forms the back surface of the seat back 4, and has an opening 61 for exposing the airbag unit 21 to the rear in the portion forming the back surface. The opening 61 is formed in a rectangular shape that is long to the left and right, corresponding to the recess 28. The opening 61 is formed to be smaller than the opening end of the recess 28 and has a slit at the boundary between the upper edge, the left and right side edges, and the lower edge. A hook 62 is coupled to the upper edge, the left and right side edges, and the lower edge of the opening 61 by sewing or the like. Each of the holder upper wall 29B, the left and right holder side walls 29C, and the holder lower wall 29D of the holder 22 is formed with a skin retaining hole 64 that penetrates in the thickness direction. The upper edge, the left and right side edges, and the lower edge of the opening 61 extend into the recess 28 and are hooked to the corresponding skin hooking holes 64 by hooks 62. The skin material 8 has a through hole 65 at a position facing the flange side insertion hole 34.

  As shown in FIG. 4, pin insertion holes 66 penetrating in the thickness direction are formed in the left and right holder side walls 29 </ b> C of the holder 22. In a state where the case 41 is received in the recess 28, the left and right pins 53 pass through the corresponding left and right pin insertion holes 66 and project to the left and right sides of the holder side wall 29C. When the skin material 8 exists at a position facing the pin insertion hole 66, a through hole through which the pin 53 can pass is preferably formed in the skin material 8. In addition, an elastic claw 67 protruding from the upper surface of the case upper wall 47A is formed in a locking hole 68 formed in the lower surface of the holder upper wall 29B. When the pin 53 is inserted into the pin insertion hole 66 and the elastic claw 67 is locked into the locking hole 68, the airbag unit 21 and the holder 22 are temporarily fixed to each other. In this state, the edge of the lid 42 and the fastening plate 46D face the flange 31 with the skin material 8 interposed therebetween, and the left and right bulged portions 55 of the fastening plate 46D protrude into the corresponding flange side insertion holes 34.

  As shown in FIG. 7, the left and right pins 53 are received in the vertical hole portions 25 </ b> A of the corresponding left and right pin locking holes 25. As a result, the left and right pins 53 and the airbag unit 21 are restricted from moving in the front-rear direction.

  As shown in FIG. 9, in the state where the left and right pins 53 are received in the vertical hole portions 25 </ b> A of the corresponding pin locking holes 25, the protruding ends of the left and right bulged portions 55 are the support plates of the left and right side frames 11. 23 is in contact with the rear surface. Each support plate 23 has a second bolt hole 71 penetrating in the thickness direction at a position facing the first bolt hole 56 of the corresponding bulging portion 55. A weld nut 72 is welded to the front surface of each support plate 23 at a position corresponding to the second bolt hole 71.

  The first bolt 74 (first fastening member) passes through the left first bolt hole 56 and the left second bolt hole 71 and is screwed into the left weld nut 72, so that the left end of the fastening plate 46D is on the left side. Fastened to the support plate 23. The second bolt 75 (second fastening member) passes through the first bolt hole 56 on the right side and the second bolt hole 71 on the right side and is screwed into the weld nut 72 on the left side. The support plate 23 is fastened. The flange 31 is sandwiched between the left end of the fastening plate 46D and the left support plate 23 at the left end, and is sandwiched between the right end of the fastening plate 46D and the right support plate 23 at the right end. In this way, the case 41 and the holder 22 are fastened to the left side frame 11 by the first bolt 74 and fastened to the right side frame 11 by the second bolt 75.

  In a state where the airbag unit 21 and the holder 22 are fastened to the left and right support plates 23 by the first bolt 74 and the second bolt 75, the left and right pins 53 cannot move up and down in the vertical hole portion 25A. It cannot be detached from the vertical hole portion 25A. In this state, the left and right pins 53 are restricted from moving back and forth by contacting the front and rear edges of the vertical hole portion 25A. Further, the locking piece 53A provided at the tip of each pin 53 abuts the front and rear edges of the corresponding vertical hole portion 25A from the left and right sides, thereby restricting the movement of the pin 53 in the left and right direction. Thus, the airbag unit 21 and the holder 22 are locked by the left and right fastening portions by the first bolts 74 and the second bolts 75 and the pins 53 and the pin locking holes 25 arranged above the left and right fastening portions. Depending on the structure, the left and right side frames 11 are supported with good stability.

  In a state in which the airbag unit 21 and the holder 22 are attached to the left and right side frames 11, the reinforcing member 32 provided on the lower side portion 31C has a left end positioned behind the left support plate 23 and a right end supported on the right side. Located behind the plate 23. That is, when viewed from the rear, the reinforcing member 32 provided on the lower side portion 31 </ b> C extends from the rear of the left support plate 23 to the rear of the right support plate 23.

  When attaching the holder 22 and the airbag unit 21 to the seat back frame 6, the holder 22 is first arranged inside the skin material 8 attached to the seat back frame 6, and the edge of the opening 61 of the skin material 8 is placed in the holder 22. Hang the part. Next, the airbag unit 21 is inserted into the recess 28 of the holder 22, and the left and right pins 53 are inserted into the corresponding pin insertion holes 66, and the elastic claws 67 are locked into the locking holes 68. Further, the bulging portion 55 is inserted into the flange side insertion hole 34. Next, the left and right pins 53 are inserted into the corresponding pin locking holes 25. At this time, by moving the airbag unit 21 and the holder 22 forward, the left and right pins 53 are inserted from the rear ends of the horizontal hole portions 25B of the corresponding pin locking holes 25, and then the airbag unit 21 and the holder By moving 22 upward, each pin 53 is moved to the upper end of the corresponding vertical hole 25A. As a result, the left and right bulged portions 55 face the corresponding support plate 23, and the first bolt hole 56 and the second bolt hole 71 are aligned with each other. Next, the first bolt 74 and the second bolt 75 are inserted into the first bolt hole 56 and the second bolt hole 71 and screwed into the weld nut 72, whereby the airbag unit 21 and the holder 22 are connected to the left and right side frames. 11 to fasten. Thereby, the holder 22 and the airbag unit 21 are attached to the seat back frame 6.

  Next, the operation when the airbag 44 is deployed will be described. When a vehicle collision is detected by the in-vehicle device, a signal is input to the inflator 43, and the inflator 43 generates gas. The gas generated by the inflator 43 is supplied to the airbag 44, and the airbag 44 is inflated. When the airbag 44 is inflated, as shown in FIG. 10, inflation pressure is applied to the case 41 and the lid 42 from the inside, the first case fragile portion 57 is cleaved, and the upper portion of the lid 42 moves backward with respect to the case 41. To do. At this time, the second fragile portion is cleaved, and the rear portion of the case upper wall 47A moves upward with respect to the initial position. At the same time, the holder upper wall 29B receives the inflation pressure of the airbag 44 through the case upper wall 47A, and the left and right holder weak parts 35 are cleaved. Thereby, the rear part of the holder upper wall 29B and the upper side part 31A of the flange 31 are moved upward with respect to the initial position. As a result, a passage extending rearward and upward is formed between the lid 42 and the case upper wall 47A, and the airbag 44 is deployed rearward and upward.

  In the seat 1 according to the present embodiment, since the edge of the skin material 8 extends into the holder 22 covered with the lid 42, there is a gap between the skin material 8 and the airbag unit 21 as viewed from the rear. It can be prevented from being formed. Further, since the deformation of the flange 31 is suppressed by the reinforcing member 32, the spread between the flange 31 and the lid 42 is suppressed. Thereby, the entrance of foreign matter between the flange 31 and the lid 42 can be suppressed. Moreover, since the rigidity of the holder 22 is improved by the reinforcing member 32, the airbag unit 21 can be supported on the side frame 11 with good stability via the holder 22.

  Since the reinforcing member 32 is disposed avoiding the holder weakened portion 35, the holder 22 can be cleaved even when the reinforcing member 32 is provided on the holder 22, and the deployment of the airbag 44 can be promoted. In addition, since the reinforcing member 32 is disposed avoiding the flange side insertion hole 34, the bulging portion 55, the first bolt 74, and the second bolt 75 can be disposed through the flange 31.

  When viewed from the rear, one of the reinforcing members 32 overlaps with the support plate 23 of the left side frame 11 at the left end and overlaps with the support plate 23 of the right side frame 11 at the right end. The side frame 11 can support the reaction force through the reinforcing member 32 with good stability.

  Since the airbag unit 21 and the holder 22 are fastened together with the support plates 23 of the left and right side frames 11 by the first bolts 74 and the second bolts 75, the attaching operation can be facilitated.

  Since the bulging portion 55 of the fastening plate 46D passes through the flange side insertion hole 34 and contacts the support plate 23, and the fastening plate 46D and the support plate 23 are fastened at the bulging portion 55, the side frame 11 is attached to the airbag. The unit 21 can be supported with good stability.

  Since the left and right pins 53 are locked in the pin locking holes 25 provided in the left and right side frames 11, the number of places where the airbag unit 21 and the side frame 11 are joined increases, and the airbag unit 21 is attached to the side frame 11. It can be supported with good stability. Since the left and right pin locking holes 25 are opened rearward by the horizontal hole portion 25B, the left and right pins 53 can be locked to the left and right pin locking holes 25 by a simple operation. Since the left and right pins 53 penetrate the left and right holder side walls 29C of the holder 22, the case 41 and the holder 22 can be temporarily fixed to each other.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the reinforcing member 32 may be disposed along the surface of the flange 31. In this case, the reinforcing member 32 can be easily disposed on the flange 31. The reinforcing member 32 may be a metal plate formed in a corrugated shape. In this case, the rigidity of the reinforcing member 32 can be improved and the weight can be reduced.

  Instead of the first bolt 74, the second bolt 75, and the weld nut 72, the case 41 and the holder 22 may be fastened together with the side frame 11 by other fastening members such as rivets.

1: Seat 4: Seat back 6: Seat back frame 8: Skin material 11: Side frame 14: Cross frame 21: Airbag unit 22: Holder 23: Support plate 25: Pin locking hole 25A: Vertical hole 25B: Horizontal Hole 28: Recess 29: Holder body 31: Flange 32: Reinforcement member 34: Flange side insertion hole 35: Holder weak part 41: Case 42: Lid 43: Inflator 44: Air bag 46: Retainer 46D: Fastening plate 53: Pin 56: 1st bolt hole 57: 1st case weak part 58: 2nd case weak part 59: Notch part 61: Opening hole 67: Elastic claw 68: Locking hole 71: 2nd bolt hole 74: 1st volt | bolt (1st 1 fastening member)
75: Second bolt (second fastening member)

Claims (13)

A vehicle seat having a seat cushion and a seat back,
A seat back frame including a pair of left and right side frames extending vertically;
A holder extending to the left and right and coupled to the corresponding side frame at the left and right ends;
An airbag unit received in the holder and deployed rearwardly;
The holder has a holder body that defines a recessed portion that opens rearward, and a flange that is provided at an edge of the recessed portion in the holder body,
The airbag unit is disposed in the recess and opens to the rear, a lid that closes the opening end of the case and faces the flange at an edge, and an inflator provided in the case And an airbag,
The vehicle seat, wherein the case and the holder are fastened to one of the side frames by a first fastening member, and are fastened to the other side frame by a second fastening member. The case has a fastening plate that contacts the outer surface of the flange,
The vehicle seat according to claim 1, wherein the case is fastened to the side frame together with the flange in the fastening plate. The flange is formed of a resin, and has a pair of left and right insertion holes facing the side frames at both left and right ends,
The fastening plate is made of metal, passes through the insertion holes and contacts the side frames,
The vehicle seat according to claim 2, wherein the first fastening member and the second fastening member fasten respective portions where the fastening plate and the left and right side frames are in contact with each other. The left and right ends of the flange are in contact with the rear surface of the corresponding side frame,
The vehicle seat according to claim 3, wherein the fastening plate sandwiches the flange from the front and rear between each of the side frames. The case is formed of metal and has a retainer to which the inflator is coupled,
The vehicle seat according to claim 3 or 4, wherein the fastening plate is formed by the retainer. The case has a pair of left and right pins that penetrate the holder body and project to the left and right sides,
Each of the said side frames has the latching hole which receives the said corresponding pin and controls the movement to the front-back direction of the said pin, The statement of any one of Claims 1-5 characterized by the above-mentioned. The vehicle seat described.   Each of the locking holes has a depth toward the left and right outer sides, and has a vertical hole portion that extends vertically, and a horizontal hole portion that extends rearward from the vertical hole portion and opens rearward. The vehicle seat according to claim 6. The case is formed of metal and has a retainer to which the inflator is coupled,
The vehicle seat according to claim 6 or 7, wherein each of the pins is formed integrally with the retainer. The holder extends along each of a bottom wall, an upper wall, left and right side walls, and a lower wall that define the recess, and a boundary between the upper wall and the left and right side walls, and extends to an outer peripheral edge of the flange. A pair of left and right holder weakened portions that are torn by the inflation pressure of the airbag,
The vehicle seat according to any one of claims 6 to 8, wherein the left and right pins pass through the left and right side walls, respectively.   The lid is swingably coupled to the lower edge of the opening end of the case, and through a first case fragile portion that is torn at the upper edge and the left and right side edges of the opening end of the case by the inflation pressure of the airbag. The vehicle seat according to claim 9, wherein the vehicle seat is joined together.   11. The vehicle seat according to claim 10, wherein the case includes a pair of left and right second case fragile portions that extend forward from an opening end at both left and right upper ends and are torn by the inflation pressure of the airbag. The inflator is disposed at a lower portion in the case;
The vehicle seat according to claim 11, wherein the airbag is disposed above the inflator in the case. The outer surface of the seat back, further comprising a skin material provided with an opening facing the airbag unit,
The edge of the opening of the skin material extends between the flange and the lid, extends into the recess, and is locked to the holder body. The vehicle seat according to any one of 12 items.

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